Intermittent current operated motor



April 6, 1948. c. s. WEYANDT ETAL INTERMITTENT CURRENT OPERATED MOTOR Filed March 5, 1946 3 Sheets-Sheet l April 6, 1948. c. s. WEYANDT EIAL INTERIITTENT CURRENT OPERATED MOTOR 3 Sheets-Sheet 2 Filed March 5, 1946 II III 54 W Q) llml E A ND 7' .Mms/E/v INVENTORS Cam. J, W y a EOWARaJ Patented Apr. 6, 1948 Carl S. Weyandt, Homer City,

INTERM ITTEN T C RRENT OPERATED T MO OR sien, Indiana, Pa.

and Edward .1. Misasslgnors to Syntron Company, Homer City, Pa, a corporation of Delaware Application March 5, 1946, Serial No. 652,074 6 Claims. (01. 172-126) This invention relates generally to reciprocating electric motors operated by interrupted current impulses and more particularly to the me- .chanical structure and the in mg the same.

ethod of construct- This invention is a continuation-in-part of application that issued on No. 2,403,034.

July 2, 1946 as Patent The principal object of the present invention is the provision of an electromagnetic core for a reciprocating electric motor and the method of constructing the same.

Another object is the provision of an improved case for a reciprocating electric motor.

otor

provision of an improved and the method of dvantages appear in the nd claims.

lustrating the prin= shown in the accomin section of the electric Fig. 2 is a view in side elevation of the electric hammer with parts sho Fig. 3 is a view in transverse secti electromagnetic core taken of Fig. 5.

4 is a view in ion electromagnetic core.

wn in section.

on of the along the line 3-3 gitudinal section of the 5 is a view in elevation of a partially astrcmagnetic cor semi ed Reierrin electromagnetic core it is tubular barrel ii made of rial such as brass, bronze, such is cylindrical as shown il-EC ati surface is made up of a se which depend upon the numi3, the number 01f g particularly to Figs. 3, 4 and 5, the

constructed on the nonmagnetic mateor a suitable alloy as aluminum. The bore of the barrel M 2 and its perimetral ber of circumferential groups of laminae employed in the core.

the barrel illustrated receiv eight laminae cumferential groups M,

M andiB are the same.

The perimetral surface of is octagonal in shape to in each of the three cirlla and it, and the groups Each of the laminae groups l4 and it; have axially disposed portions H and radial portions 58.

The lamina group i5 has an axial portion 2% and the radial portions 2! respectively. The end laminae groups It! and it are provided with the pole faces 23 and 24 respec laminae of the intermediate withv the pole cfaces 25 and inwardly projecting tively, whereas each group I5 is provided 26, one at each end in assembled relation.

thereof. The pole of each group projects through windows 22 in the wall of the barrel and the pole faces are preferably flush with the bore. Each of the pole faces is preferably hardened since they are exposed to the reciprocating armature 21 made of magnetizable material and h welded or otherwise attached to its end the members 28 of nonmagnetic impact resisting material, such as Stellite or its equivalent.

The barrel ii is provided with the projecting flanges 2'9 and 30 at the ends thereof, the=perimetral surfaces of which are arranged to receive the rings 39 and 32 which magnetically connect the laminae of the groups M and it.

In assembling the core Ill, the rings 3! and 32 are pressed in place on the perimetral surface of the flanges and the laminae groups are then placed in position and temporarily tied by the wire loops or bands 33 which securely hold them The end laminae groups it and it are then welded or brazed as at 34 to secure them to the rings ill and 32 respectively. The other or inner ends of the laminae groups M and iii are thenbrazed to the perlmetral surface of the :barrel as shown at 35 and 38. Each of the intermediate laminae group I 5 is also brazed at either end to the barrel as shown at 3? and 38. Thus the eight laminae sections of each group it, i5 and it are permanently secured to the barrel ii and their poles 28 to 2B are exposed in the bore ofthe barrel. The temporarily tied wires or hands 33 may then be removed.

The gaps between the ends of the laminae in adjacent groups are then closed by the two nonmagnetic bridge members 30 and ll by" welding their ends as indicated at it. By using two bridge members between each laminae section the core member is materially opened up permitting greater air circulation and also decreasing the weight of the core over that shown in Patent 1,797,253 without sacrificing efiiciency. Improved electrical characteristics are also obtained by the use of this core structure.

After the bridge memb to the core member 08 they form an octagonal surface. It is then chucked in a lathe and the perimetral longitudinal portions of the laminae and bridge members are stantially cylindrical surface 43 as indicated on the left side in Fig. 3, and the pole faces 23, 24, 25 and 2B are ground flush with the bore l2. This fabricated core member l0 thus provides two grooves or spool sections for receiving electromagnetic coils.

A series of annular grooves 44 are cut in the outwardly aving.

ers have been secured turned to provide a subdependently varnished to perimetral surface 4! and in the axial sections I! and 2b of the three groups of laminae as shown in 5.

Split insulating washers 85 are then assembled on the core member adjacent the radial sections 18 on both sides of the central radial section 26 as shown in Fig. 1. The intermediate surface of the laminae groups and the bridge members are then varnished and wound with one layer of insulating cord 45. The insulating cord is wound so that it fills the grooves diand provides a smooth and uniform spool surface. A fine cotton string is then wound over the core to fill it up and the whole of the insulating surface is varnished. Two layers of linen tape halt lapped are then wound on the string and cord and inform the insulation 68. Since the insulating cord and string are tightly wound and interlock in the grooves iil'they provide a very firm and uniform foundation for the insulating tape and the coils. This foundation is substantially cylindrical. The electromagnetic coils dB and 52 are then uniformly wound tightly on the core, with the. first layer imbedding itself into the insulation on the core, and are covered with insulation. The lead wires of the coils are taken out at one end of the core as indicated at 51. Thus the motor windings are firmly locked on the core and when subjected to vibration will not become loose or become otherwise inoperative due to continued vibration of the hammer, since the cord '46 is embedded and interlocked in the grooves i l and the wire is embedded in the insulation and the cord. This structure provides a material improvement in this hammer.

The electromagnetic core i is then inserted into thecylindrical casing 58. A nose casting 53 is fitted on the lower provided with a recess to receive the lower end of the tube 1 i and the ringSi. As shown in Fig. 2 the nose casting 53 is provided with oppositely disposed ears 55 having holes therethrough to receive the assembly bolts 55 which extend upwardly 'on each side of the casing 56 and pass through aligned holes in the top or handle casting $8.

The nose casting 53 is provided with a series of radially disposed ribs ET. A series of holes 58 are out in the nose casting 53 to permit the air to pass from the coils and through the holes 59 from the bore of the barrel.

The bushing 60 is heldin the casting by the spring M which look washers and bolts 62.

The ends of the casing 58 are beveled to look into the matched surfaces of the nose and handle castings which are held in assembled relation by the nuts 63 on the bolts 55 as shown in Fig. 2. The spring 54 held by the bolts 65 has a central recess fitting around the barrel 6% and engages the outer end of the core stop clamping ring t1, the inner end'of which engages the core stop seat 68. The radial flange of the seat 68 engages the core member iii and the cylindrical portion fits into the bore of the core member. Thus the core member id is held by the nose casting 53, the nose bushing GB and spring 6! at one end and by the seat 58 and spring 6 3 at the other end. A double spring id is held on the bolts 55 by the nuts Hand is provided with a central aperture that fits over the top of the barrel 68. The double spring engages the annular flange 72 on the outer surface of the barrel forcing it down against the top of the flange of bore of the nose of the bridge members ell and end of the casing and is is secured by the y d the seat 68. The top or the barrel 88 is closed by the plug seat 13 which is engaged by the upper end of the coil spring id. The lower end of the spring holds the core stop 15 against the seat es and the lower end or the stop projects in the bore of the electromagnetic core iii in which the reciprocable core member 2? operates. e core I stop barrel 6'6 and the core stop it are vented and is supported by to prevent entrapment or compression or air therein due to the fast reciprocating action of the movable core member 2?.

The top or handle casting it has the rotary motor casing 75 formed integral therewith for housing the field Ti and the armature id. The upper end of the armature shaft is supported in the frictionless bearing is which permits limited axial movement or the armature. The other end of the casing i5 is provided with an enlarged bore to receive the flanges casting 38 having a central sleeve supported by the radial arms has an axial bore to receive the lower frictionless bearing 82. The outer race of the bearing 82 is slidable axially within the bore of the casting the helical spring 88 resting on the cap 85. The inner race of the bearing 8i seats against the shoulder 85 on the armature shaft. A perforated disc as is mounted in the bottom end of the casting dd.

The armature shaft has the fan member-v ill secured thereto. As the motor rotates air is drawn into the vortex of the fan through the perforated screen 85 and past the radial arms 8 i. The fan member N then forces the air radially through the passageway 88 into the annular chamber 89 in the lower end of the handle casting Bifrom whence it flows axially of the hammer passing between the casing 52 and the coils .48 and 50 and down between the laminae sections inside the coils to the loweriend of the casin where it is discharged through the'openings 58 inthe nose casting 53 to cool the hammer coils. This circulation of air permits the use of less iron and coils of lower resistance.

As disclosed in the parent case the series wound motor is connected in multiple with the lower hammer coil d8 on the line side of the trigger switch 9H mounted in the hollow handle of the handle casting 56. The hammer is operated on half wave alternating current which may be supplied by rectliiers. One half of the alternatingrcurrent wave is valved to operate one hammer coil and the other half the other hammer coil. Although the operation of the hammer and the series motor are controlled by the switch Q8, the rectifiers are controlled by an alternating current switch adjacent thereto and are ordinarily energized during a job but the hammer is stopped and started when needed. When the hammer is not used for relatively long periods of time the rectifier-s are deenergized.

We claim:

1. An electromagnetic reciprocating motor field comprising a tubular barrel of nonmagnetic material, a plurality of spaced circumferential groups of radially disposed laminated core members secured to the barrel, the core members of the groups being aligned and having pole faces exposed to the interior of the barrel, a pair of parallel bridge members connecting the adjacent ends of the core members to provide a continuous support therebetweento form a coil baseon the core members, a series of annularly disposed grooves formed in the perl metral surface on the core members, insulation material wound around the core members and in the grooves, and

ti and or a wire coil wound on the insulating material interlocking with the insulation in the grooves to firml lock the coil against movement reia tive to the core members. i

2. An electromagnetic reciprocating motor field comprising a tubular barrel of nonmagnetic material, a plurality of spaced circumferential groups of radially disposed laminated core members secured to the barrel, the core members of the groups being aligned and having pole faces exposed to the interior of the barrel, a pair of parallel bridge members secured to and connect ing the adjacent ends of the aligned core members to provide a continuous support therebetween to form a coil base on the core members, the .perimetral surface of the core and bridge members being arcuate, a series of grooves formed in the perimetral arcuate surface of the core and bridge members, insulating material around the core and bridge members and in the grooves, and a wire coil wound on the insulating material and interlocking with the insulation in the grooves to firmly lock the coil against movement relative thereto.

3. An electromagnetic reciprocating motor field comprising a tubular barrel of nonmagnetic material, a plurality of spaced circumferential groups of radially disposed laminated core members secured to the barrel, each core member having an outwardly extending portion and a longitudinally extending portion with a pole face exposed to the interior of the barrel and the core members of the groups being aligned, a pair of parallel bridge members secured to and connecting the adjacent ends of the aligned longitudinal portions of the core members to provide a continuous support forming a coil base between the outwardly extending portions, the perimetral surfaces of the longitudinal portions and the bridge members being arcuate and having a series of grooves formed therein, insulating material wound around the said continuous support and in said grooves, and a wire coil wound on the insulating material and interlocking with the insulation in the grooves to firmly lock the coil against movement relative thereto.

4. A casting for a reciprocating motor con sisting of a bell-shaped end chamber arranged to receive and seal with a tubular housing containing the reciprocating motor, a rotary motor wound {Q chamber formed integral with. one side of the beli sliaped end chamber and having a fan chamber interposed betveen the rotary motor chamber and the bell-shaped chamber, and said casting providing a straight passage connecting the fan chamber with the bell-shaped end chamber to direct air thereto for cooling the reciproeating motor.

5. A handle casting for a reciprocating motor consisting of a hand grip having a bell-shaped and chamber arranged to receive and seal with a reciprocating motor housing, a rotary motor chamber formed integral'with one side of the hand grip and with its axis parallel to that of the bell-shaped chamber, a fan chamber integral with the rotary motor housing and the handle, and said casting providing a lateral discharge from the fan chamber to the bell-shaped chamber for the discharge of cooling air to the motor housing.

6. In a reciprocating motor the combination of a tubular housing enclosing a reciprocating motor, a nose casting enclosing the working end of the motor housing,a handle casting enclosing the other end of the motor housing, means to secure said housing and castings in assembled relation, a bell-shaped chamber in the handle casting opening into the motor housing, a cooling motor housing formed integral with the hendle housing and having a rotary motor mounted therein, a fan driven by the rotary motor to cool the same, a housing for the fan formed integral with the handle housing and providing a straight discharge to the bell-shaped chamber for directing a portion of the air to cool the reciprocating motor.

I CARL s. WEYANDT.

EDWARD J. mssmn. REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 794,398 Drake July 11, 1905 2,403,034 Weyandt July 2, 1946 FOREIGN PATENTS Number Country Date 140,480 Switzerland Sept. 1, 1930 

